Introduction: An unhealthy lifestyle is often represented by a variety of health behaviours like physical inactivity, an unhealthy diet, excessive drinking and smoking. As a consequence, it is a major cause of chronic diseases and related to reduced quality of life, productivity losses and substantial health care costs. Interventions that can effectively stimulate a healthy lifestyle will thus yield important societal benefits. A landmark systematic review has shown that Internet-based health behaviour change interventions can effectively promote a healthy lifestyle (Webb, Joseph, Yardley, & Michie, 2010). In particular Internet-based interventions that are tailored to the specific characteristics of the individual participant – using online computer-tailoring strategies – have been found to be effective in enhancing various health behaviours (Lustria et al., 2013).
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